At the national level, from the last June 14th to Sunday, there was a reduction of the Rt from 1.20 to 1.1, which was also registered in the Lisbon and Vale do Tejo region, where it went from 1.26 to 1.11, according to the weekly report of the epidemic curve of the National Institute of Health Doctor Ricardo Jorge (INSA),
For the INSA researchers, this result suggests “a slowdown in the increase in the number of new cases in this period of time, that is, the number of new cases keeps growing, but more slowly”.
On the other hand, in the Algarve region there is “a sharp increase” in the transmissibility index, having gone from 1.07 on May 27, 2021 to 1.4 on June 14 (0.33 in 19 days).
“From this date onwards, the Rt decreased to 1.3 to June 19, although it still remains at high values”, stresses the INSA
The purpose of this status report is to present the estimates of the epidemic curve of SARS-CoV-2 infection by symptom onset date and the estimates of the transmissibility parameters R0 (basic reproduction number) and Rt (effective reproduction number as a function of of time).
After correcting the epidemic curve for the delay in notification, based on the data collected, the INSA estimates that up to last Sunday 869,663 cases had occurred.
According to the researchers, the mean value of Rt for the days 16-20 June was 1.14, and its true value could be between 1.13 and 1.15 with a confidence of 95%.
The following R(t) values were also estimated for the regions: 1.03 in the North region, 1.12 in the Center region, 1.17 in the LVT region, 1.08 in the Alentejo region, 1.34 in the Algarve region, 0.98 in the autonomous region of the Azores and 1.17 in the autonomous region of Madeira.
“All regions have an average rate of transmissibility (five days) above 1, with the exception of the Autonomous Region of the Azores”, the researchers say.